Shiyali Ramamrita Ranganathan  12 August 1892 – 27 September 1972) was a mathematician and librarian from india.His most notable contributions to the field were his five laws of library science and the development of the first major analytico-synthetic classification system, the colon classification. He is considered to be the father of library science, documentation, and information science in India and is widely known throughout the rest of the world for his fundamental thinking in the field. His birthday is observed every year as the National Library Day in India.He was a university librarian and professor of library science benaris at  HinduUniversity (1945–47) and professor of library science at the University of Delhi (1947–55). The last appointment made him director of the first Indian school of librarianship to offer higher degrees. He was president of the Indian Library Association from 1944 to 1953. 
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